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Dallas police on Monday afternoon said their investigation of two shootings within blocks of each other early Monday morning revealed the murders were related and tied to drug activity. (Published Monday, Aug 18, 2014)

Updated at 7:09 PM CDT on Monday, Aug 18, 2014

Dallas police said their investigation of two shootings within blocks of each other early Monday morning revealed the murders were related and tied to drug activity.

Officers were still looking for the suspects Monday night.

Dallas Police Investigate Two Deadly Shootings

Dallas police are investigating two deadly shootings within blocks of each other early Monday morning in Oak Cliff. (Published Monday, Aug 18, 2014)

"We are continuing to interview several witnesses. We believe that multiple suspects are involved," Dallas Police Maj. Rob Sherwin said.

The first deadly shooting happened in the 2900 block of Prince Hall Lane around 4 a.m. Witnesses at the Sunrise Village Apartments told NBC 5 they heard five to 10 gunshots.

2 Dead in 2 Shootings in Dallas

Dallas police are investigating two shooting blocks apart that left two people dead early Monday morning. (Published Monday, Aug 18, 2014)

"I was sitting on the patio and next thing I know I heard, 'Pow! Pow! Pow!' Over and over," said Rosemont resident Jessica Duckett, who counted five gunshots.

About the same time, a teenage boy stumbled in to a 7-Eleven at the corner of East Ledbetter Drive and Sunnyvale Street. Demarcus Mangis was working behind the counter and said the teen was bleeding and begging for help.

"I was like, 'Are you alright?' And he was like, 'They shot me. They shot me three times.' And he had blood coming from his ankle and also his butt, his rear end," Mangis said.

"I was like, 'Just lay here and don’t move. I'll stay with you and call the ambulance. That's all I can do.'"

Sherwin said police suspect both 16-year-olds were shot together at the Rosemont of Oak Hollow complex, and the survivor was able to get away.

He said the second shooting may have been payback for the first.

"It could be that there was a robbery, possibly, and then someone went over to another location to re-acquire their property," Sherwin said.

Residents said they hear gunshots every night and worry about escalating violence in the neighborhood.